Revolving-hook mechanism.



F. KULHAWY.

REVOLVING HOOK MECHANISM.

APPLICATION FILED OCT. 21. 1914.

1 1 52,740. Patented Sept. 7, 1915.

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FERDINAND KULIlAWY, 0F PHILADELPHIA, PENNSYLVANIA.

REVOLVING-HOOK MECHANISM.

Specification of Letters Patent.

Patented Sept. *7, 1915.

Application filed October 21, 1914. Serial No. 867,778.

To all whom it may concern:

Be it known that I, FERDINAND KULHAWY, a subject of the Czar of Russia,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inRevolving-Hook Mechanism, of which the following is a specification.

This invention relates to certain new and useful improvements inrevolving hook mechanism.

An object of the present invention is to provide a bobbin case supportand bobbin case for sewing machines in which the bobbin case per 86 isparticularly constructed to carry a greater amount of thread, and to beused with the usual operating mechanism.

A further object of the invention is to provide a revolving hookmechanism in which the bobbin case carried by a suitable support isformed with a guide against which abuts an arm of the thread loopingmechanism to positively guide the thread to form a loop and obviate abreak in the stitching or knotting of the thread.

Other objects of the invention will appear as the nature of the same isbetter understood, and the device consists in the novel construction,combination and arrangement of parts to be hereinafter more fullydescribed, and then claimed.

In the accompanying drawing formin a part of this application and towhich re erence is had herein by like characters designatingcorresponding parts throughout the several views, Figure 1 is an endelevational view of the bobbin case and support therefor. Fig. 2 isaside elevational view of the same. Fig. 3 is a horizontal sectional Viewof the same. Fig. 1 is a longitudinal sectional view. Fig. 5 is amodification of the device showing the bobbin case in use with acontinuous rotating thread looper. Fig. 6 is a front elevational View ofthe bobbin case. Fig. 7 is a vertical longitudinal sectional view of thesame. Fig. 8 is a detail perspective view of the thread spool, and Fig.9 is a detail perspective view of one of the bobbin case clamping arms.

Briefly described, the improvement consists in providing a sewingmachine bobbin case and operating mechanism therefor in which the bobbincase is constructed with a View of containing a larger amount of thread,and in which the same is held positioned within the support therefor byparticular clamping means. The bobbin case is provided with an extensionon one side thereof, in the form of a substantially semicircular guideor track overwhich the revolvingarm of the revolving hook mechanism isadapted to travel, and be in continuous contact therewith for the majorportion ofits movement to insure a positive separation of the loopedthread, in order to position'the same about the thread issuing from thebobbin case.

My invention is equally applicable to mechanism on an oscillatory orcontinu ously rotated revolving hook mechanism, which will appear in thefollowing detail description.

Referring more in detail to the accompanying drawing, the referencenumeral 10 designates the support or body portion of the revolving hookmechanism and is provided with a lateral extension 11 beneath which, asclearly indicated in Fig. 4 the bobbin case and supporting mechanism aresuspended. The bobbin case supporting mechanism consists of a pair ofarms 12 and 13 suitably shaped as shown in detail in Fig. 9 with the arm12 formed substantially rigid with the extension 11, while the arm 13 isprovided with a detent enlargement 1 1 at the upper end thereof and bywhich the said arm 13 is pivoted to the extension 11 as indicated at 15in Figs. 2 and 4. A finger grip 13 is carried by the arm 13 and affordsmeans for moving the said arm on its pivot 15. The bobbin case 16 ispositioned between the arms 12 and 13, and has a slight relativemovement thereto, so that the thread being looped, in a manner to behereinafter described, will be permitted to pass between the arms 12 and13 and the bobbin case 16. A fiat spring 17 is connected at one end tothe body support 10 and engages at its free end the enlarged head orshoulder 14; to hold the same in open or closed position as shown byfull and dotted lines in Fig. 1. Lugs 16 are carried by the bobbin caseto be engaged by the arms 12 and 13 to add rigidity to the device, andlimit the move ment of the bobbin case in one direction, the said bobbincase being limited in its movement in the opposite direction by the lips1a.

The bobbin case 16 comprises the usual shell device consisting of asocket or spool holder portion 18 of increased size and closed at itsouter end by the spring pressed hinged cap plate 19. The thread spool 20shown in Fig. 8 is provided axially of the I 16 is aresilient springplate 25, the partieular design of which is shown more clearly in Fig.6, with the free end thereof bent inwardly to spring into a smallopening pro vided in. the front face of the bobbin case, it beingtheobject of this plate to tension thethread passing'through the opening24.

The opposite face of the bobbin case 16 is provided with a substantiallysemi-circular guide or track 26 over which the thread revolving arm isadapted to pass.

The operating mechanism for the bobbin case support and looper armembodies a shaft 27 jour-naled in the support 10 as indicated in Figs. 3and a, and has the operating end thereof provided with an angularly bentarm 28 carrying on its outer end the thread revolving head 29. Therevolving head 29 consists of a bifurcated or forked member with anangular base wall 30, and of outer and inner furcations 31 and 32respectively, so that the thread to be looped as indicated at a in Fig.1, and the angular base wall 30 insuresa separation of the thread whenthe revolving head 29 passes over the guide track 26.

The shaft 27 is oscillated, and imparts a similar movement to therevolving head 29 dining which movement, the looper head 29 engages theloop thread afed downwardly from the upper face .of the machine andpasses over the guide track 26 in such position as to separate the loopthread a so that each strand of the loop will be positioned on oppositesides of the bobbin case and pass between the bobbin case supportingarms 12 and '13 and the bobbin case 16.. WVhen the looper head 29reaches the dotted line position shown in Fig. 1, the 'loopthread a willbe permitted to escape from the looper head, and by being drawnoutwardly will pass about the single thread 6 issuing Copies of thispatent may be obtained for from the bobbin case spool '20 to therebyform a loop. In its travel over the guide track 26, the looper head 29is in continuous contact therewith for the major portion of the lengthof its travel so that the thread a will be positively separated ordivided over the bobbin case.

A modification of the invention is shown in Fig. 5, and in this instancethe construe tion discloses a continuously rotatable revolving hookmechanism. The support 10 carries an arm 33 provided with asupporting'member 84 on which is mounted the'bobbin case 16. The shaft27 angular extensions 2S and looper head 29 are identical in structure.to the parts before described, and are continuously rotated, to catchthe upper thread. a to loop the same and form a tie with the thread b.

While the forms of the invention herein I shown and described are whatare believed to be the preferred embodiments thereof, minor changes maybe made therein without departing from the spirit and scope of theinvention as set forth in the claim.

What I claim as new is The combination with a substantially L-- I pairof broad and flat arms of resilient f material having opposed convergingsides, 1n combinatlon with a bobbin case having converging sidesterminating in a guide rib,

the bobbin case being adapted to be locked in the arms in one positiononly and a revolvmg hook carried by said shaft and oscillat-able overthe guide rib.

In testimony whereof I afhX my signature in presence of two witnesses.

FERDINAND KULHAVVY.

Witnesses: LUDWIK MIoHALsKI, 'JOSEPH J. RosE BLU'rH.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I

